chore(styling): add CSS variable for .slick-cell optional flex

[ghiscoding]

• add new --slick-cell-display CSS variable to optionally change display to flex for aligning middle but keep block as default

[stackblitz]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.7%. Comparing base (90690f4) to head (f108b7d).

Additional details and impacted files

@@          Coverage Diff           @@
##            next   #1490    +/-   ##
======================================
  Coverage   99.7%   99.7%            
======================================
  Files        197     197            
  Lines      21652   21652            
  Branches    7207    6938   -269     
======================================
  Hits       21586   21586            
- Misses        60      66     +6     
+ Partials       6       0     -6     

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